Process of producing divinyl.



'fully the following UNITED STATES PATENT OFFICE.

FRITZ HOFMANN AND CARL OOUTELLE, OF ELBERFELD, GERMANY, ASSIGNORS TO FARBENFABRIKEN .VORM. FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A

CORPORATION OF GERMANY.

PROCESS OF PRODUCING DIVINYL.

No Drawing.

s 5 ecification of Letters Patent.

Patented Oct. 10, 1911.

We have found that divinyl (erythrene) can be obtained by a complete alkylation of tetramethylendiamin and by decomposition of the quaternary ammonium base. Divinyl is thus produced absolutely pure with a very good yield. The substance is intended for the manufacture of synthetic rubber and other technical products.

In order to illustrate the new process more example is given, the parts being by weight: A solution of 224 parts of potassium hydroxid in 500 parts of water is added to 88 parts of tetramethylendiamin. Then 855 parts of methyliodid are gradually introduced in small portions, the solution being cooled and the mixture is shaken until the combination with the tetramethylendiamin has taken place. The tetrameth lenhexamethyldiamin-iodid thus formed of the formula:

is then converted into the corresponding hydrate in the usual way 6. g. by, means of oxid of silver. The hydrate is "a strongly basic almost colorless oil which hitherto could not be crystallized. It decomposes easily under suitable conditions, e. g even Application filed February 3, 1910. Serial No. 541,761.

on warming, into water, trimethylamin and the product known in literature as divinyl which can be condensed by sufiicient cooling and kept in pressure bombs.

Instead of CH I other halogen alkyls may be used, 6. g. ClCH etc., and also other agents of alkylation e. g. dimethylsulfate,

etc. I

The process proceeds probably according to the following equations: 

